I don't know ___.A.what to say and to do B.what to say or do 为什么不需要后面的那个to.

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I don't know ___.A.what to say and to do B.what to say or do 为什么不需要后面的那个to.

I don't know ___.A.what to say and to do B.what to say or do 为什么不需要后面的那个to.
I don't know ___.A.what to say and to do B.what to say or do 为什么不需要后面的那个to.

I don't know ___.A.what to say and to do B.what to say or do 为什么不需要后面的那个to.
答案是B
记住这个句型:not- - - - or - - - -
She is NOT a doctor OR a nurse.
He doesn't know A or B.

这是一个否定句,肯定句中的and,在否定句中要换成or. 又因为前面有了一个to ,后面的to 在语言习惯上省略。

i dont know what to say or do. 否定句里面,and 通常转化为or do 前面的to,与第一个to重复,因此可以省略 I don't know what to say. I